There could be a variety of main characters. Maybe there's an old person who is nearing the end of their life and is reflecting on their past in the face of death being so near. Or perhaps a detective in a crime - ridden area where death is a common occurrence, and he has to deal with the emotional and psychological toll of being in such close proximity to death all the time. Again, this is all speculation without actually reading the novel.
The main theme could be about mortality. Since death is personified as a 'neighbour', it might explore how people face the proximity of death in different ways.
Typically, in a 'Hello Neighbour' - themed graphic novel, there would be the main character who is the curious neighbour. This character is often the one driving the plot forward by being intrigued by the strange goings - on at the neighbour's place. And then, of course, there would be the neighbour with all the secrets. There might also be other minor characters from the neighbourhood who add to the overall atmosphere and story, like other neighbours who have noticed odd things but haven't really delved into it as much as the main character.
Since I haven't read the novel, I can't say for sure. But I assume Lord Death is one of the main characters. There might also be characters who are his allies or enemies, perhaps a young hero or heroine who either helps or opposes him during his return.
I'm not sure as I haven't read it, but presumably Lord Death is one of the main characters since the title mentions him. There could be other characters like his family members or friends in his home who play important roles in the story.
I don't know the specific main characters in this light novel as I haven't read it. But typically, in a story with a death flag concept, there might be a protagonist who is in the center of the situation. There could also be a mentor - like character who gives advice on how to avoid the death flag.
I'm not entirely sure, but usually there is a central character who is likely a young person going through various experiences.
In 'Now Voyager', Charlotte Vale is the central figure. She is a complex character who starts off as a repressed and unfulfilled woman. Then there are characters like Dr. Jaquith who plays a significant role in Charlotte's transformation. There are also other characters in her family and in the places she travels to that either hinder or help her growth. For example, the people she meets on her voyages open her eyes to new ways of living and thinking, while her family members' initial expectations of her had been holding her back. All these characters together create a web of relationships that drive the story forward.
I have no idea as I haven't read it. There's not enough information given to determine the main characters.
Perhaps there could be friends or family members who play important roles. They might be the ones who support or oppose the main character's journey of revelation. They could also be characters who are dealing with their own grief in different ways, adding more depth to the story.
Once, my neighbour was sick. I noticed that she hadn't taken out her trash for a few days. So I decided to take it out for her. When she found out, she was really grateful. After that, we started to look out for each other more often. For example, if I'm away, she'll keep an eye on my house and vice versa.